<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="jsp/checkInput.jsp">
    <table>
        <tr>
            <td>
                <h3>请输入5个字符后提交</h3>
                <input type="text" name="test06Input" id="test06_input" size="30">
            </td>
        </tr>
        <tr>
            <td>
                <input type="submit" name="test06Submit" id="test06_submit">
            </td>
        </tr>
    </table>
</form>
<script>
    window.onload = function() {
        document.getElementById('test06_input').focus();
    } 
</script>
</body>
</html>